Any time I am over 160, I feel exactly as you discribe. People say at those times that I get out of a chair like my dad, who is 28years older than me.
When I was young, and diabetes knowledge was in its infancy, they called me a brittle diabetic, which meant hard to control. I can jump all over the map blood-sugar wise and in a very short period with no obvious cause.
I believe I still am "brittle" for several reasons (one is occasional gastroparesis) and have to both eat low carb and test constantly to avoid going high, even with the amazing help of a pump. I don't particularly like the term "brittle", but it does discribe a problem that I still have.
Recently, Richard157 posted a diabetes resouce site and I was surprised to see the term "brittle" used there. It has pretty much gone out of fashion, but unfortunately for those of us who have this problem, it's very real and unpredictable. There was a note on Richard's page that said research is showing that people who are "brittle" are more women than men. It also said it is being found that brittle diabetics have a more pronounced reaction to stress. This is an observation I have made about myself many times.
I'm keeping my eye on the research, but I am thinking that if you keep your sugar lower (100-140) for a while, your muscles and tendons will feel better.
One other pain problem. When you first get a pump and get into better control, some of your nerves hurt for a while as they become healthier. But it's a good hurt when you know what it is
Justl my opinion, of course,
Mich